ALLEN PARK, Mich. — Matthew Stafford’s status is again uncertain after he hurt his right shoulder late in the fourth quarter Sunday in a 23-20 overtime loss to the New York Jets. He separated the same shoulder in the season opener and missed the next five games.

Lions coach Jim Schwartz said the two injuries aren’t related, but the team plans to be careful with Stafford.

MLive.com reported Tuesday that preliminary tests on Sunday showed that Stafford had a Grade 3 separation of his right shoulder and the team fears the quarterback might be lost for rest of the season.

None of Detroit’s quarterbacks were in the locker room Monday when it was open to reporters, although Stafford later told WJR radio he doesn’t think he’ll play this weekend at Buffalo.

Schwartz said Stafford had an MRI on Monday and that surgery wasn’t being discussed, but that it’s too early to tell how severe this injury is. According to MLive.com’s report, it is not known if the MRI results confirmed the team’s initial diagnosis.

“I think I just, all our tests and consultations and everything else, I just won’t comment any more on,” Schwartz said. “He’ll be thoroughly evaluated.”